Breakdown of Дети обычно приоткрывают окно ночью.
окно
window
обычно
usually
ночью
at night
дети
children
приоткрывать
to open slightly (imperfective)
Questions & Answers about Дети обычно приоткрывают окно ночью.
How exactly does the prefix при- change the meaning of открывают in this sentence?
The prefix при- is used here to indicate an incomplete, slight, or gentle action (the attenuative meaning). While открывают means 'they open', приоткрывают means 'they open slightly' or 'they crack open'. This is a very common use of при- with verbs of physical action.
Since cracking a window is a completed physical result, why isn't the perfective verb приоткроют used?
The adverb обычно (usually) tells us this is a repeated, habitual action. In Russian, habitual actions almost always require the imperfective aspect, even if each individual instance has a clear result. Therefore, we use the imperfective приоткрывают instead of the perfective приоткроют.
Does adding the attenuative prefix при- change the case of the object the verb takes?
No. Just like the base verb открывать (to open) takes a direct object in the accusative case, the prefixed verb приоткрывать also takes the accusative (окно). Prefixes that just modify the degree of the action usually do not alter the verb's underlying grammatical rules.
Why is 'at night' translated as ночью without any preposition?
To specify a time of day or a season, Russian uses the bare instrumental case without a preposition. Ночью is the instrumental form of ночь (night). You see this same pattern with утром (in the morning), днём (in the afternoon), and вечером (in the evening).
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